. The American fruit culturist. syllas, which are smaller than those whichhibernated, and lay eggs on the leaves for anotherbrood. At least four broods of the insect develop in a seasonin New York and probably five in Maryland. Many pear-treesare so much weakened by the drain of so many little pumpssucking the sap that they do not have enough vitality to sur-vive the winter. The insect is thus both a serious menace tothe tree and to the crop of fruit. It is very important that this pest should be checked earlyin the season, as the psyllas can be more easily hit with a l82 DESTRUCTIVE
. The American fruit culturist. syllas, which are smaller than those whichhibernated, and lay eggs on the leaves for anotherbrood. At least four broods of the insect develop in a seasonin New York and probably five in Maryland. Many pear-treesare so much weakened by the drain of so many little pumpssucking the sap that they do not have enough vitality to sur-vive the winter. The insect is thus both a serious menace tothe tree and to the crop of fruit. It is very important that this pest should be checked earlyin the season, as the psyllas can be more easily hit with a l82 DESTRUCTIVE INSECTS. spray then, and every member of the first brood that is killedgreatly reduces the numbers of the following broods. Inbadly infested pear-orchards it would pay to drench the barkof the trees in winter with a spray of whale-oil soap, dissolvingabout one pound in two or three gallons of water, and to eachhundred gallons of this add ten gallons of crude this spray, or with a kerosene-water pump, using 30 or. Fig. Pear Slug, a, Adnlt saw-fly ; b, slug with slime removed;c, same in normal state ; d^ infested leaves, natural size ; a, b, c, much enlarged.(U. S. Div. of Entomology.) 40 per cent, of kerosene, most of the hibernating psyllas couldbe killed, and thus the pest be checked for the coming nymphs and many of the adults can be killed in summerby thorough work with a spray of whale-oil soap, one poundin five gallons of water, or with a kerosene-water pump,using about 10 or 15 per cent, of kerosene. Sometimes then^^mphs become covered with honey-dew, and it is difficult tohit them with a spray. Hence, just after a hard shower is agood time to make the application, as much of the honey-dewwill be washed off. Prompt and thorough work in May orearly June on the first brood is necessary if one is to controlthis pest. It is a very difficult matter to check it if it is letalone until later in the season. The Pear or Cherry Slug {Eriocampoide
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